Pumping mechanism for vapor gases



July 21, 11925. 1,546,397

H. C. MICHELSEN PUMPING MECHANISM FOR VAPOR GASES Filed, OQCr l5, 1921 4i/W g {$13. 2 43 .4 gwuemtoz Patented July 21, 3925.

.urrso STATES HENRY C. MICHELSEN, OF YOINKERS, NEW YORK.

PUMPING MECHANISM FOR VAPOR GASES.

Application filed October 15, 1921. Serial No. 507,830.

T all whom it may concern:

Be it known that I, HENRY C. MICHELSEN, a citizen of the United States,and resident of city of Yonkers, county of Westchester, State of NewYork, have invented certain new and useful Improvements in PumpingMechanism for Vapor Gases.

The device the subject of this invention is intended as a means forpumping vapor gases and particularly fugitive gases, that it has in thepast been found difiicult 'to pump, because of the inability to packpistons or to provide piston rings that would efficiently retain suchgases.

The device that T will describe has been designed in a manner toaccomplish the pumping oi such gases as it prevents leakage bycompensating pressures; the compensation taking place at that place orat the point where leakage occurs with greatest frequency.

Another object of the invention is to produce a simple pumping mechanismand one wherein the only communication from the pumping cylinder will bethrough the valve mechanism and one wherein the leakage which occurspast the pumping piston will be received and confined within a portionof the device to be again delivered to the pumping cylinder.

Anbther object of the invention is to produce a pump wherein a highpossible pressure and a piston pump can be combined with the securityand elliciency of a diaphragm pump. With these objects in view thefollowing is what I consider the best means for carrying out thisinvention and the accompanying drawing should be reterred to for acomplete understanding of the specification which follows.

In the drawing Fig. 1 is a centrally vertical section.

Fig. 2 a similar view but with less detail and showing a modifiedconstruction.

Similar reference numerals indicate like parts in all the figures wherethey appear.

At 1, Ishow the base or supporting member of my device. this member maybe made of cast iron and is provided with uprights 2 and 3 and a flangel.

Formed integral with or supported upon the uprights 2 and 3 are bearingboxes 5 and 6 provided with suitable lubricators as shown at 7 and 8 andadapted to support the driving shaft 9.

The shaft 9 is provided with a crank 10 and crank pin 11 and a suitablelubric'ator 12 is also provided for the crank pin. The shaft is rotatedfrom a pulley 13 or from or by any other suitable means.

Supported between the uprights 2 and 3 is a cylinder 14 provided withaflange 15 and adapted to receive bolts as shown at 16 and 17 Thiscylinder may also be made of cast iron although any other suitablematerial may be employed and within the cylinder I arrange or providevalve ports, the outlet port is indicated at 18 and the inlet port at 19and over'these ports are valves as shown at 20 and 21. These valves maybe flat, flexible and resilient metal plates or disks, suitably securedin operative position theone interidr andthe other exterior of thecylinder and a plug 22 allows access to the valve 18.

To allow the interior of the cylinder to be ground and to simplify theoperations in the construction, the valves may be arranged in a cylinderhead 23 screw-threaded as shown at 24 into the cylinder 14.

Operable within the cylinder is a piston 25 provided with suitablepiston or packing rings and in this construction I have shown two pistonrings as indicated at 26 and 27.

Upon the crank pin 11, I arrange a bearing member 28 which supports andoperates a piston rod 29, this rod 29 is provided with a ball 30 and asupporting cup 81 secured to the piston 25 retains the ball 30 in amanner well understood.

It will be noted that the wall of the piston extends beyond and exteriorto the end of the cylinder in which it operates and that in fact thepiston is of a length greater than the length of the clear wall of thecylinder. At the end of the piston nearest the crank shaft and thereforat the end projecting from the cylinder 1 provide upon the piston aflange 32 which may be formed integral with the piston and which extendsoutward beyond the walls of the cylinder. In this flange I produce agroove 33 into which is secured by brazing, soldering or otherwise, oneopen end of a diaphragm 'or breather member 34 which extends almost thefull length of the cylinder enclosing the cylinder and the other end ofthis diaphragm her is secured in a groove 35 in t e 15 of the cylinder.

'While the diaphragm member 34 may be "formed of any suitable materialll prefer that it be constructed of thin sheet copper,

m'embrass or other desirable ductile and flexible member and while Ihave shown this diaphragm member provided with eight convolutions,projections or fins and a suitablenumber of inward projections orrecesses it will be understood'that a greater or lessv number ofconvolutions may be given the Y diaphragm, the number of which will bedetermined by the desired speed of movement or number of revolutions perminute of the shaft 9 or by the length of the cylina der or by otherconditions. The ends of the diaphragm member should be secured not onlyby insertion into the grooves 33and 35 but by soldering.

In the operation of this device the gas is drawn inward through the pipe36 and valve 21 into the cylinder and at the same time the suctionoccasioned by the outward movement of the piston will cause a suction onboth sides of the piston rings and when the gas or vapor is dischargedthrough the valve 20 and pipe 37 by the retuin movement of the piston anapproximately equal pressure will he found on both sides of the rings 26and 27.

The suction and pressure on the outer sides of the rings are caused bythe expansion and contraction or the accordion movement of the diaphragmor breather 84. If gas or vapor should leak past the rings, it will beentirely retained in the diaphragm member passing into this member itwill be discharged therefrom by the compression or contraction of thediaphragm, but I have discovered that in operation the suction andpressure upon both sides of the rings equalize preventing the passagethere through of gas or vapors being pumped.

In the foregoing I have described the preferred construction, I am awarehowever, that modifications may be made and a device constructed thatwill accomplish the purposes set forth. One such device is shown in Fig.2 where only the principal elements are set forth. 7

In this figure the cylinder is shown at 40, the piston at 41, the crankshaft at 42 and it 'will be noted that the piston is of a relativelygreater length than the .piston shown in Fig. 1. v

In this Fig. 2 the diaphragm of flexing member 43 is connected at theopen end of the cylinder, a suitable flange 44 being provided thereforand the other end of the expansible and compressible member 43 isconnected to a suitable flange 45 upon-the piston. The connections maybe made by means of a series of pins reeniiorced by solder, cement oreven Welding.

Other modifications may be made Within the scope ot'the appended claimswithout departing from the principle or sacrificing the advantages ofthe invention.

Having carefully and fully described my invention what I claim anddesire to obtain is as follbws:

1. A compressor for refrigerating systems, comprising relatively movablecompressing members forming a chamber therebetween, a flexible casingsurrounding and forming a sealed joint between said members, and meansfor conducting fluid to and from said chamber, substantially asdescribed.

2. A compressor comprising a piston member, a cylinder member, means foradmitting the fluid to be compressed to the space between said members,means for exhausting the compressed fluid therefrom, and a flexiblecasing surrounding and forming a sealed j oint between said members,substantially as described.

3. A compressorcomprising a piston member, a cylinder member, inletandoutlet connections to and from thespace between said members, and aflexible extensible casing connected at one end to one of said membersand at the other end to the other of said members and forming a sealedjoint between said members, substantially as described.

4. A compressor for refrigerating machines, comprising relativelymovable compressing members forming a chamber therelwtween, and ametallic bellows enclosing said relatively movable members and attachedthereto, substantially-as described.

5. A compressor for refrigerating ma? chines having cylinder and pistonmembers,

-inlet and outlet connections for said members, and a metallic bellowsenclosing said cylinder and piston members and attached thereto,substantially as described.

Signed at the city, county and State of New York, this 4th day ofOctober, 1921.

HENRY c. MICHE-LSEN.

